(1-1/1+x)(1-1/x²)计算要过程

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(1-1/1+x)(1-1/x²)计算要过程

=[(1+x-1)/(1+x)]*[(x^2-1)/(x^2)]
=[x/(1+x)]*[(x+1)(x-1)/x^2]
=(x/x^2)*[(x+1)(x-1)/(1+x)]
=(1/x)*(x-1)
=(x-1)/x